THE DEPTH AND MARINE DEPOSITS OF THE PACIFIC OCEAN. 59 



Calcium carbonate : 11.80 per cent, principally pelagic Foraminifera, 

 many broken; with a good many Fishes' teeth, and a few bottom-living 

 Foraminifera {Rotalia). 



Eesidue : 88.20 per cent, mostly '•' fine washings," the larger washings 

 from 12 grams of clay amounting to only a few centigrams : — 



Siliceous Organisms (traces), very few Sponge spicules. 



Minerals (traces) ; the rare particles present are angular, and only very 

 few attain a diameter of 0.1 mm. ; most of them belong to some decomposed 

 basic mineral, and are present as greenish, neai'ly opaque, flakes ; plagioclase, 

 augite, manganese grains, and phillipsite (in the form of isolated crystals, 

 not in clusters) may be recognized. 



Fine Washings (88.20 per cent), chocolate-brown flocculent clay, the 

 dark color being due to numerous very minute grains of manganese ; a few 

 small crystals of phillipsite and other minute mineral particles observed. 



No. 31. Station 4703, 27th December, 1904. 

 Lat. 17° 18.6' S. ; long. 100° 52.3' W. ; depth, 2228 fathoms. 



GLOBIGERINA OOZE : earthy-brown, plastic, but not sticky ; the dried 

 lumps are only slightly coherent ; a few Foraminifera visible to the naked 

 eye. 



Calcium carbonate : 40.92 per cent, pelagic Foraminifera (mostly 

 broken). Fishes' teeth, a few small Echinoid spines, and various bottom-living 

 Foraminifera. 



Residue : 59.08 per cent : — 



Siliceous Organisms (0 per cent). 



ilf/Hera/s (traces); the principal mineral is phillipsite in crystals, 0.03 mm. 

 in length, and always isolated ; a few particles, angular and 0.06 mm. in 

 mean diameter, belonging to a decomposed mineral, are nearly opaque, 

 brown, and have lost all birefringence ; manganese grains are numerous, but 

 very small. 



Fine Washings (59.08 per cent), flocculent clay, colored brown by 

 minute manganese grains, with a few very small mineral particles. 



No. 32. Station 4705, 28th December, 1904. 

 Lat. 15° 5.3' S. ; long. 99° 19' W. ; depth, 2031 fathoms. 



GLOBIGERINA OOZE : light gray, in places yellowish, chalky. 



Calcium carbonate : 78.62 per cent, a great variety of pelagic and 



